Mobile Application Developer

Mobile Developer / Mobile Tech Lead – iOS & Android Location: Helsinki, Finland (Hybrid – 50% Remote / On-site in Helsinki)Contract Duration: 15 Oct 2026 – 15 Apr 2027 (Freelance B2B Contract, extension potential)Workload: Full-Time (100% / 37.5 Hours per Week)Languages: Fluent English (Mandatory) Position Summary: We are seeking a Senior Mobile Developer / Mobile Tech Lead with dual-platform expertise across iOS (Swift) and Android (Kotlin) for a contract assignment based in Helsinki. In this role, you will combine hands-on development with technical leadership to drive the UI uplift, modernization, and architecture of core mobile digital banking applications. Key Responsibilities: Lead UI improvement initiatives to deliver a consistent, modern, and user-friendly experience across mobile platforms.Design, develop, and maintain features for iOS (Swift) and Android (Kotlin) applications.Contribute to mobile architecture patterns (MVVM, VIPER), technical designs, code reviews, and continuous improvement frameworks.Ensure high quality through unit testing, UI test automation, REST API integration, and performance/security optimization.Take full ownership of delivered solutions, including implementation, testing, deployment, and post-launch support. Qualifications & Requirements: Mobile Seniority: 7+ years of professional experience in mobile application development with a proven track record of delivering large-scale solutions.Dual-Platform Mastery: Deep expertise in primary native stack (Swift or Kotlin) combined with strong hands-on capability in the other.UI Modernization Track Record: Experience leading or driving UI modernization, redesign, or uplift initiatives in mobile apps.Architectural & UI Frameworks: Solid knowledge of MVVM/VIPER, UIKit/Auto Layout, Jetpack Compose, XML layouts, and Fragments.Quality & Integration: Strong understanding of unit testing, UI test automation, REST API integration, and mobile security practices.Domain Knowledge (Desirable): Previous experience in banking, payments, or financial services IT solutions is a strong advantage. If you are interested, or you know someone that could be, please reach out and we can arrange a time to speak soon?